高压套管绝缘缺陷监测方法的研究

发布时间：2018-05-26 19:01

本文选题：高压套管 + 绝缘缺陷　；参考：《华北电力大学》2014年硕士论文

【摘要】：高压绝缘套管是电气设备的重要附件(如主变套管等),用于变压器、电抗器等电气设备高压引线对金属外壳的绝缘,是电力系统的重要组成部分,其绝缘性能直接关系电网的安全、稳定和经济运行。现行的高压套管绝缘缺陷监测方法在可靠性和实用性等方面尚存在一些问题。因此,研究更为有效的高压套管绝缘缺陷监测方法,具有重要的工程意义。本文提出了一种高压套管绝缘缺陷的监测方法。该方法以套管的暂态电压和电流(由系统正常操作或其它设设备故障引起)为信息源,由暂态电压和电流得到套管绝缘缺陷监测和诊断的判别函数,根据判别函数的最大值诊断套管的绝缘缺陷。本文建立了套管的等效网络模型,以变压器套管为例进行了高压套管简化电场分布研究,根据轴、径向场强的相对大小确定套管等效横、纵向电容的比例,提出了根据套管的介损试验数据确定等效网络参数的方法。通过仿真和试验对提出的监测方法进行了验证。大量的ATP仿真结果证实了该方法的有效性和可行性。本文以110kV电容式充油套管为例建立了具体的模型,设置了表示不同绝缘缺陷程度的三种工况,对套管故障诊断方法进行了试验验证。三次试验的诊断结果基本正确,对套管工作状态正常与否可以做出准确诊断。实验室试验结果初步证实了该方法的有效性和可行性。本文提出的监测方法,只需要与相关设备共享的套管的暂态电压和电流,即可实现变压器套管绝缘缺陷位置与严重程度的监测与诊断。不需要注入信号和庞大甚至复杂的附加设备,经济实用,具有较强的可操作性。
[Abstract]:High voltage insulating sleeve is an important accessory of electrical equipment (such as main transformer casing, etc., used for insulation of metal shell by high voltage lead wire of transformer, reactor, etc., and is an important part of power system. Its insulation performance is directly related to the security, stability and economic operation of the grid. There are still some problems in the reliability and practicability of the current insulation defect monitoring method for high voltage sleeving. Therefore, it is of great engineering significance to study a more effective method for monitoring insulation defects of high voltage sleeving. This paper presents a method for monitoring insulation defects of high voltage sleeving. In this method, the transient voltage and current of the casing (caused by the normal operation of the system or the failure of other equipment) are used as the information source, and the discriminant function for monitoring and diagnosing the insulation defects of the casing is obtained from the transient voltage and current. The insulation defect of casing is diagnosed according to the maximum value of discriminant function. In this paper, the equivalent network model of casing is established, and the simplified electric field distribution of high voltage bushing is studied by taking transformer bushing as an example. According to the relative magnitude of axial and radial field strength, the proportion of equivalent transverse and longitudinal capacitance of casing is determined. A method for determining the equivalent network parameters based on the test data of casing dielectric loss is presented. The proposed monitoring method is verified by simulation and experiment. A large number of ATP simulation results show that the method is effective and feasible. In this paper, taking 110kV capacitive oil-filled casing as an example, a concrete model is established, and three kinds of working conditions are set up to express different insulation defects. The fault diagnosis method of casing is tested and verified. The diagnostic results of the three tests are basically correct, and the correct diagnosis can be made on whether the casing is in normal working condition or not. The experimental results show that the method is effective and feasible. The monitoring method proposed in this paper only needs the transient voltage and current of the bushing shared with the relevant equipment to realize the monitoring and diagnosis of the location and severity of the insulation defects of the transformer bushing. There is no need for injection signal and large or even complicated additional equipment. It is economical and practical and has strong maneuverability.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM855

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